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Example: link-by-link signalling

Exchange

SPC = 82

Circuit 14

SPC = 22

SPC = 60

Circuit 20

SPC = 18

SPC = 15

STP

SL 4

Outgoing MTP MSU:

OPC = 22 CIC = 20

DPC = 60 SLS = 2

SL 2

SL 7

STP

Outgoing message:

OPC = 82 CIC = 14

DPC = 22 SLS = 4

Processing in (transit) exchange(s):

Using routing table and incoming routing label, exchange inserts DPC (60) and CIC (20) into outgoing routing label (no number analysis … )

Using MTP-level routing table, STP routes message to DPC = 22

Otherwise like link-by-link routing,

only difference is here